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This location is a maintenance area for the coolant facility consisting of halls and rooms with metal walls, and featuring a small system of drainage tunnels. Before the incident, the double doors connecting Sector C to the area are guarded by a security guard, making the location restricted and inaccessible to Gordon Freeman. It is connected to a lower canal system through a large lift.

The canal is crossed by a footbridge that leads to a large elevator going up to the Administrator Center in Sector D, but it has collapsed following the Resonance Cascade. To cross the canal, several maintenance areas and labyrinthine corridors must be traversed from maintenance doors at the canal level, as well as a large and deep room featuring a track system for crate transportation, not in function during Freeman's visit.

The canal area of the Coolant Reservoir Facility was present in the 1997 version of the game and was initially much larger. The final rendition of the map includes many unused set pieces left over from the cut sections of the location. Moreover, the pre-release form of the hanging crates room appears to have featured a puzzle.